The state Gaming Control Board issued a warning Monday saying the devices made by Google Inc. could be used to cheat at card games.

New Jersey regulators issued a similar anti-Glass directive last week.

Several Las Vegas casino operators, including Caesars Entertainment Corp. and MGM Resorts International, have directed workers to ask gamblers to remove the devices if they suspect it is being used to secretly photograph or record.

Nevada regulators advise that the techie glasses should be banned outright on the gambling floor. They warn that the device can be used to share information among colluding card players.